Which of the following statements regarding the default scheduler in the Alcatel-Lucent 7750 SR are TRUE? (Choose two)

Question

Options

• AThere are a maximum of 8 levels of priority serviced using a round-robin algorithm.
• BThe default scheduler will spend an equal amount of time in each queue, as long as there is traffic
• CThe H1 internal forwarding class will receive its CIR before AF traffic.
• DOrphaned queues will be scheduled out of the BE queue.
• EA queue servicing EF and AF traffic will require explicit configuration to set the queue to

• A
  19% (5)
• B
  4% (1)
• C
  67% (18)
• D
  11% (3)

Explanation

C is correct because the 7750 SR default scheduler uses strict priority - H1 (High Priority 1) sits above AF (Assured Forwarding) in the hierarchy, so H1 queues are fully serviced and receive their CIR before AF traffic is ever touched. E is correct because EF and AF are distinct forwarding classes mapped to separate queues by default; combining them into a single queue requires explicit configuration to define how that queue should be prioritized and scheduled.

A is wrong because while there are 8 forwarding classes, they are serviced using strict priority, not round-robin - higher-priority queues drain first. B is wrong for the same reason - equal time per queue describes round-robin, which is the opposite of strict priority behavior. D is wrong because orphaned queues (those whose parent scheduler is missing) are not automatically folded into the BE queue; they lose their scheduling reference and are handled based on platform-specific orphan behavior, not BE scheduling parameters.

Memory tip: Think of the default scheduler as a strict VIP queue at a venue - NC, H1, EF, H2, L1, AF, L2, BE are served in that exact order, with VIPs (high priority) always getting in first. Nothing is shared equally; EF and AF only share a queue if you explicitly configure it.

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